Before you can start using the patcher, you need to download and extract the latest files required for it. Instructions on how to do it are located in "what_to_put_here.txt" in the "resources" folder.

After that, you will need an .apk. Go to this link: https://github.com/revanced/revanced-patches/blob/main/README.md
Find the package you're interested in, and note which version the current patches target.
After that, find the desired .apk that suits your device on this website: https://www.apkmirror.com

After that's done, drop the APK's you wish to patch into the "input" folder and then run the "ReVanced Patcher.bat" script. It should patch all the apps, and then you will be able to find the patches versions in the "output" folder, move them over to your phone and install them.